How to save filters in ImageFilterView

Question

I'm using this code to save an image from ImageFilterView. It works with ImageView.

fun saveImage(image: ImageFilterView, context: Context) {
    val thread = Thread(object: Runnable {
        override fun run() {
            val bitmap = (image.drawable as BitmapDrawable).bitmap
            val file = Environment.getExternalStorageDirectory()
            val dir = File(file.absolutePath + "/Pics")
            dir.mkdirs()
            val filename = "${System.currentTimeMillis()}.png"
            val outFile = File(dir, filename)
            var outStream: FileOutputStream? = null
            try {
                outStream = FileOutputStream(outFile)
            } catch (e: Exception) {
                e.printStackTrace()
            }
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream)
            try {
                outStream?.flush()
            } catch (e: Exception) {
                e.printStackTrace()
            }
            try {
                outStream?.close()
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }
    })
    thread.start()
}

It saves without the filters applied (saturation, brightness, warmth, contrast), even though it appears in the app with the filters.

Is there a way to save a version of the photo with the filters applied?